1996 Chevrolet Corvette Owner's Manual - Page 257

What toUse Use a mixture of one-half clean water (preferably distilled) and one-half DEX-COOL (orange-colored, silicate-free) antifreeze that meets GM Specification 6277M, which won't damage aluminum parts. Use GM Engine Coolant Supplement (sealer) (GM Part No. 3634621) with any complete coolant change. If you use this mixture, you don't need to add anything else. TM NOTICE: If you use an impropercoolant mix, your engine could overheat andbe badly damaged. The repair cost wouldn't be covered by your warranty. Too much water in the mix can freeze and crack the engine, radiator, heatercore and other parts. If you have to add coolant more than four times a year, have your dealer check your cooling system. Adding only plain water to your cooling system can bedangerous. Plain water, or some other liquid like alcohol,can boil beforethe proper coolant mix will. Your vehicle's coolant warning system is set for the proper coolant mix. With plain wateror the wrong mix,your engine could get too hot but you wouldn't getthe overheat you warning. Your engine could catch fire and or others could beburned. Use a 50/50 mix of clean water andDEX-COOL (orange-colored. silicate-free) antifreeze. TM NOTICE: If you usethe propercoolant, you don't have to add extra inhibitors additives which claim to or improve the system. Thesecan be harmful. .